An electrode pulsed to a large positive potential (V>>kTₑe) in a collisionless magnetoplasma is observed to draw currents far in excess (10×{}) of the field-aligned electron saturation current prescribed by probe theory. The large currents are inferred to be due to anomalous cross-field transport caused by current-driven instabilities. Electric fields due to space-charge separation and anomalous conductivity lead in time to ion expulsion from the current channel and hence to density depletion and current collapse.
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Urrutia et al. (1986) studied this question.
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